configuration management in Drupal 8

Raise your hand if the built-in config system in Drupal 8 saved your work life, too! That, of course, until you started to notice a crack here and there... And till you realized that you kind of depend on contrib modules for... filling in those holes. But then, the Configuration Management Initiative 2.0. came about and, along with it, the promise that all your legitimate questions would be answered: What about multisite and shared config? What about the zip workflow? What about config changes on... production? What about extending the configuration...